Question

我想将VC文本字段中的信息发送到ConfirmationVC。同样，然后我想将信息从VC 2上的文本字段发送到ConfirmationVC。 ConfirmationVC应该显示在VC 1和VC 2中输入的数据，但是应用程序崩溃。

注意：VC 1和VC 2在同一VC文件（RegisterVC）上。 VC 3在其自己的VC文件（ConfirmationVC）中。这是三个视图控制器中的picture。

我得到以下错误：线程1：信号SIGABRT。

感谢您的帮助！

//Source VC
class RegisterVC: UIViewController {


@IBOutlet weak var firstName: UITextField!
var firstNameS = ""

@IBOutlet weak var lastName: UITextField!
var lastNameS = ""

@IBOutlet weak var birthday: UITextField!
var birthdayS = ""

@IBOutlet weak var height: UITextField!
var heightS = ""


override func viewDidLoad() {
    super.viewDidLoad()
}


@IBAction func sendPage1(_ sender: Any) {
    self.firstNameS = firstName.text ?? "empty"
    self.lastNameS = lastName.text ?? "empty"
    self.birthdayS = birthday.text ?? "empty"


    performSegue(withIdentifier: "P1", sender: self)
}



@IBAction func sendPage2(_ sender: UIButton) {
     self.heightS = height.text ?? "empty"

     performSegue(withIdentifier: "P2", sender: self)
}




override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    var vc = segue.destination as! ConfirmationVC // connect both VC's

    vc.confirmFirstNameD = self.firstNameS
    vc.confirmLastNameD = self.lastNameS
    vc.confirmBirthdayD = self.birthdayS
    vc.confirmHeightD = self.heightS

}

}


//Destination VC
class ConfirmationVC: UIViewController {


@IBOutlet weak var confirmFirstName: UILabel!
var confirmFirstNameD = ""

@IBOutlet weak var confirmLastName: UILabel!
var confirmLastNameD = ""

@IBOutlet weak var confirmBirthday: UILabel!
var confirmBirthdayD = ""

@IBOutlet weak var confirmHeight: UILabel!
var confirmHeightD = ""




override func viewDidLoad() {
    super.viewDidLoad()
    confirmFirstName.text = confirmFirstNameD
    confirmLastName.text = confirmLastNameD
    confirmBirthday.text = confirmBirthdayD
    confirmHeight.text = confirmHeightD
}

Answer 1

您的第一个VC未连接到您的Confirmation VC。 Segue指向的不是您的第二个VC。所以当你说

var vc = segue.destination as! ConfirmationVC

该应用程序将崩溃。您需要具有不同的搜寻条件，因为您要做希望每个人都有不同的目的地。

此外，我强烈建议您为VC使用不同的类。这将使您的代码更易于使用和调试。

Answer 2

就像@BCza所说，最好将代码分成两个单独的视图控制器，因为它们毕竟会收集不同的数据。您可以将信息从第一个VC传递到第二个VC，然后将所有信息从第二个VC传递到ConfirmationVC。您的代码将如下所示：

第一个VC

class FirstVC: UIViewController {


@IBOutlet weak var firstName: UITextField!
var firstNameS = ""

@IBOutlet weak var lastName: UITextField!
var lastNameS = ""

@IBOutlet weak var birthday: UITextField!
var birthdayS = ""

override func viewDidLoad() {
    super.viewDidLoad()
}


@IBAction func sendPage1(_ sender: Any) {
    self.firstNameS = firstName.text ?? "empty"
    self.lastNameS = lastName.text ?? "empty"
    self.birthdayS = birthday.text ?? "empty"

    performSegue(withIdentifier: "P1", sender: self)
}

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    var vc = segue.destination as! SecondVC // cast to SecondVC to set the saved values below

    vc.savedFirstName = self.firstNameS
    vc.savedLastName = self.lastNameS
    vc.savedBirthday = self.birthdayS    
}

}

第二个VC

class SecondVC: UIViewController {

@IBOutlet weak var height: UITextField!
var heightS = ""

//These will be given a value upon segueing from the first view controller to the second
var savedFirstName = ""
var savedLastName = ""
var savedBirthday = ""

override func viewDidLoad() {
    super.viewDidLoad()
}   

@IBAction func sendPage2(_ sender: UIButton) {
     self.heightS = height.text ?? "empty"

     performSegue(withIdentifier: "P2", sender: self)
}

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    var vc = segue.destination as! ConfirmationVC // pass the data from both VC's to ConfirmationVC

    vc.confirmFirstNameD = self.savedFirstName
    vc.confirmLastNameD = self.savedLastName
    vc.confirmBirthdayD = self.savedBirthday
    vc.confirmHeightD = self.heightS

}

}

来自两个View Controller的数据已添加到Third View Controller

2 个答案: